Sulfoborite Mineral Data

General Sulfoborite Information

Chemical Formula:

Mg3B2(SO4)(OH)8(OH,F)2

Composition:

Molecular Weight = 361.67 gm

Magnesium 20.16 % Mg 33.43 % MgO

Boron 5.98 % B 19.25 % B₂O₃

Hydrogen 2.65 % H 23.66 % H₂O

Sulfur 8.87 % S 22.14 % SO₃

Oxygen 59.72 % O

Fluorine 2.63 % F 2.63 % F

- % F -1.11 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₃B₂(SO₄)(OH)₈(OH)_1.5F_0.5

Environment:

Uncommon mineral in marine salt deposits.

IMA Status:

Valid Species (Pre-IMA) 1893

Locality:

Westeregeln, Saxony-Anhalt, and at the Wittmar potash mine, Asse, southwest of Braunschweig, Lower Saxony, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for the sulfur and boron in the composition.

Name Pronunciation:

Sulfoborite + Pronunciation

Synonym:

ICSD 31195

PDF 39-1347

Sulfoborite Image

Images:

Sulfoborite

Comments: Colorless transparent sulfoborite crystal.
Location: Lake Inder, Atyrau, Kazakhstan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Sulfoborite Crystallography

Axial Ratios:

a:b:c =0.8081:1:0.6201

Cell Dimensions:

a = 10.132, b = 12.537, c = 7.775, Z = 4; V = 987.62 Den(Calc)= 2.43

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.05(1), 3.09(1), 3.47(1),

Physical Properties of Sulfoborite

Cleavage:

{100} Good, {001} Distinct

Color:

Colorless.

Density:

2.44

Diaphaneity:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

4-4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Sulfoborite

Gladstone-Dale:

CI meas= 0.038 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.034 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2214,KPDmeas= 0.2205,KC= 0.2291
Ncalc = 1.56

Optical Data:

Biaxial (-), a=1.527, b=1.536, g=1.551, bire=0.0240, 2V(Calc)=78, 2V(Meas)=79.6.

Calculated Properties of Sulfoborite

Electron Density:

Bulk Density (Electron Density)=2.47 gm/cc
note: Specific Gravity of Sulfoborite =2.43 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Sulfoborite= 1.13 barns/electron
U=PE_Sulfoborite x rElectron Density= 2.79 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Sulfoborite is Not Radioactive

Sulfoborite Classification

Dana Class:

27.01.05.01 (27)Compound Borates

(27.01)Dana Type

(27.01.05)Dana Group

27.01.05.01 Sulfoborite Mg3B2(SO4)(OH)8(OH,F)2 P nma 2/m 2/m 2/m

Strunz Class:

06.AC.55 06 - BORATES

06.A - Monoborates

06.AC -B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc.

06.AC.55 Sulfoborite Mg3B2(SO4)(OH)8(OH,F)2 P nma 2/m 2/m 2/m

Other Sulfoborite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Sulfoborite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Sulfoborite

Mg3B2(SO4)(OH)8(OH,F)2
Dana No: 27.01.05.01 Strunz No: 06.AC.55
Locality:

Notes:

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